Automatic lock for jarring rollover molding machines



July 7; 1931.

J. T. RAMSDEN AUTOMATIC LOCK FOR JARRING ROLLOVER MOLDING MACHINES Filed April 15, 1930 2 Sheets-Sheet l m/vzwrofi (Jo/977 Famsa e/z' W/IWESS:

' ATTOIP/VEK July 7, 1931. J. T.' RAMSDEN AUTOMATIC LOOK FOR JARRING ROLLOVER MOLDING MACHINES Filed April 15, 1930 2 Sheets-Sheet 2 Q m nswrw? (20/522 Fawn-a e av fa s MM,

AZTOIPA/EY.

Patented July 7, 1931 UNITED STATES PATENT. OFFICE JOHN T. RAMISDEN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE TABOR MANUFACTURING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA AUTOMATIC LOCK FOR JARRING Application filed April 15,

The subject of my invention is an automatic lock for holding a pattern plate to the rollover arm or frame of a jarring rollover molding machine. My device is an improved look for this purpose which is not readily af fected by sand and which is of simple and rugged construction.

For a further exposition of my invention reference may be had to the annexed drawings and specification at the end whereof my invention will be specifically pointed out and claimed.

In the drawings,

Figure 1 is a side elevation, partially in cross section, of my device.

Figure 2 is a view in enlarged detail showing some of the parts of Figure 2 in different positions.

Figure 3 is an end view of the rollover arm 7 looking to the right in Figure 1.

Figure 4 is a cross section on the line 41 of Figure 1.

In the illustrations shown, 1 is the rollover plate with which rollover machines are equipped. It is shown supported on the usual jarring machine head 2.

3 is one of two arms that form part of the rollover frame 4 which revolves about the trunnion shaft or center 5. The rollover movement is by means of rollover cylinder similar to U. S. Patent 1,072,395 to W. Lewis and the applicant. V

6 shows one side or edge of a stationary housing as shown on the drawings.

7 and 7 are yokes attached to the rollover table 1 by means of bolt 8.

9 are adjusting screws in yokes 7. Usually there are four yokes 7 two in each of the two rollover arms.

10 is a swinging lock hinged on the pin 11 l which has its bearing in the rollover arm 3. Each pair (or more) of the locks 10 are coupled together by means of the rods 12 which are screwed into the swivel pins 13. A similar connecting rod 14 couples this swing lock to the crank arm 18 which swings about the shaft 16 which turns in the arms 3.

In the crank arm 15 is a roller 17 which in the position shown rides on the face of the stationary housing 6.

ROLLOVER MOLDING MACHINES 1930. Serial No. 444,446.

15 and 18 are keyed to the shaft 16 which serves to operate similar looks at the opposite side of the machine. This shaft serves to keep all looks: Working at one and the same time which is safer than if each pair on each side are operated by an independent spring and roller. Coupled to arm 15 is a spring 19 one end of which swivels on a pin 20 which is fixed in the rollover arm 3. As shown this spring is under tension and tends to pull the locks in the direction shown by arrow in Figure 1but is resisted by the roller 17 which is held against the housing 6 by reason of the weight of the rollover frame 3 &c., acting about center 5, which is enough to overcome tension of spring 19.

In operation the rollover frame 3l moves upward revolving about the center 5. As it moves up, the shaft 16 travels with it and carries the lever arm 15 away from the housing 6. The spring 19 holds the roller 17 against the housing; this causes the lever 15 and roller 17 to revolve about the shaft center 16 and this in turn swing the locks 10 about their center 11 until the stop 21 strikes the pin 22 and limits the travel of lever 15. At this point the end 23 of the lock 10 is directly over the stop bolt 9. In this position the line of thrust is directly through the bolt 9 and pin 11 and there is no tendency for the load to disengage them when the plate is rolled over the opposite side of the molding machine in the pattern drawing position, i. e., when rolled over the plate 1 and its load is suspended on four or more points represented by bolts 9. This locking device can also be operated by means of air cylinders instead of sprin s, but is not as reliable as the construction s own. This device is not very easily effected by sand as is a wedge device because of the swinging of the lock 10 over the top of the bolt which tends to shove off any sand that may have lodged on top of bolt 9. The lock 10 is in the form of an inverted U to permit the bolt 9 to travel up free during the arring operation, i. e., the table 1 moves up and down and carries the yokes 7 up and down with it. It will be noted that the yoke 7 has a cross tie in which is carried the bolt 9. This bar serves a double purpose, i. e., forms support for bolt 9 and connects the two sides of yoke 7 so that should the lock 10 fail to move into position over the bolt 9, the rollover table 1 cannot at any time fall away from the rollover arm 3. Figure 2 shows lock 10 engaged with stop bolt 9 after roller 17 leaves housing 6.

I do not intend to be limited in the practice of my invention save as the scope of the prior art and of the attached claims may require.

I claim:

1. In combination, a stationary housing, a rollover plate, a rollover arm, a crank arm pivotally mounted on said rollover arm, a roller mounted in said crank arm and adapted to roll on said stationary housing, a spring attached to said crank arm and to said rollover arm stressing said roller against said stationary housing, a locking member adapted to engage said rollover plate to lock it to said rollover arm, and means connected to said crank arm and to said locking member whereby said crank arm actuates said locking member. V

2. Mechanism according to claim 1 in which said locking member is a U-shaped member pivotally mounted on said rollover arm.

3. Mechanism according to claim 1 in which said rollover plate has a yoke attached thereto and said rollover arm has an opening therein to accommodate saidyoke, said yoke cooperating With said locking member.

JOHN. T. RAMSDEN. 

